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Old 12-11-2015, 11:03 AM   #15
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1984 34.5' Airstream 345
Foothill Ranch , California
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Chris,
A couple of things...
That valve should have a black plastic cap on the single nipple end, which encompasses the twin electrical connector, AND a little filter that fits over the open nipple. The nipple on that end, acts as a vent/bleed when the valve is not energized.
Here is a Diagram taken from my 1984 GM Factory Service Shop Manual.
Everyone should have a copy of the relevant year GM manual for the "10/20/30 Light Truck" as it has the most complete info out there, and is invaluable. I found my scrappy copy on Ebay for $20.

It seems, your solenoid is mounted on the thermostat housing which is correct. Mine is not!



As I have to understand what each emissions item does and how it works, I dug into this component, and what it does.
It seems that a signal is sent from the Distributor Tach output between 1700rpm and 1890rpm to the"Engine Speed Switch", which should be mounted on the rear part of the left hand valve cover...
And here is mine, bottom lh side of pic. This was before I refitted my emissions correct Quadrajet.


This switch then energizes the solenoid to open, sending vacuum to a the "Throttle Lever Actuator", a vacuum pod on the carb, holding the throttle open.
I believe this holds the throttle open to stabilize the mixture upon deceleration.
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Old 12-12-2015, 01:37 PM   #16
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1979 28' Airstream Excella 28
Boynton Beach , Florida
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Here is a video of her running, replaced the thermostat and bypassed the vacuum switch for now, have one coming in on Monday and will replace it. sorry about the fuzzy picture, it appears the camera lens had something on it. It does not appear to be overheating anymore. Next up, new exhaust as its badly needed an a new gas tank.
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Old 12-12-2015, 01:51 PM   #17
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1979 28' Airstream Excella 28
Boynton Beach , Florida
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Where is the best place to get a new coolant overflow tank, this one has a hole in it, another video too.. anyone know what the white plastic bottle with fluid in it is to the left of the overflow tank?
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Old 12-12-2015, 02:12 PM   #18
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1983 30' Airstream 300
Covington , Louisiana
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This is the replacement reservoir I used. Nice size, holds about a gallon.
Dorman 603-100 Coolant Reservoir Bottle
http://www.amazon.com/gp/product/B00...ilpage_o07_s00
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Old 12-12-2015, 03:33 PM   #19
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2007 22' International CCD
Corona , California
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The little bottle may be windshield washer fluid supply.? Where does the hose on top of it go?


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Old 12-13-2015, 07:14 PM   #20
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1984 34.5' Airstream 345
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On my 84, coolant reservoir on the pass side and windshield washer reservoir on the drivers side.
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